Iraqi Army Kills Civilians in Tikrit Airstrike, Say Residents

Government Says Deaths Were Limited to 42 Sunni Extremists

BAGHDAD—An Iraqi army airstrike in the country's north killed at least seven civilians and wounded 12 more, residents said Sunday, further inflaming antigovernment sentiment among the country's Sunnis that insurgents are thriving on as they continue to take territory.

Iraqi army helicopters fired on civilian cars lined up outside a gas station in the city of Tikrit in the early hours of Sunday morning, residents said, while the...